I have 6. All happy, cared for, well fed, looked after, enough space for them all to have their own areas, most of the time they get on, and enough litter trays for them all. The oldest one is 16 and the youngest is 21 months. The others are 3, 4 and two 11 year olds.
I would like another cat though.
But I'm afraid that if I contacted a rescue centre they would come to do a visit and say a firm NO on the grounds of TOO MANY CATS.